Electric heating – Metal heating – By arc
Reexamination Certificate
2011-05-31
2011-05-31
Paschall, Mark H (Department: 3742)
Electric heating
Metal heating
By arc
C219S076160, C219S121590, C219S121480, C219S121520
Reexamination Certificate
active
07952047
ABSTRACT:
An improved automatic feedback control scheme enhances plasma spraying of powdered material through reduction of process variability and providing better ability to engineer coating structure. The present inventors discovered that controlling centroid position of the spatial distribution along with other output parameters, such as particle temperature, particle velocity, and molten mass flux rate, vastly increases control over the sprayed coating structure, including vertical and horizontal cracks, voids, and porosity. It also allows improved control over graded layers or compositionally varying layers of material, reduces variations, including variation in coating thickness, and allows increasing deposition rate. Various measurement and system control schemes are provided.
REFERENCES:
patent: 5047612 (1991-09-01), Savkar et al.
patent: 7112758 (2006-09-01), Ma et al.
Michael A. Gevelber, “Process Control,”Wiley Encyclopedia of Electrical and Electronics Engineering, 1999, John Wiley & Sons, Inc.
Y. C. Lau, et al, “Inelligent Processing of Materials for Thermal Barrier Coatings,” TBC Workshop, 1997, NASA Lewis Research Center, Cleveland, OH.
J. R. Fincke, et al, “Feedback Control of the Subsonic Plasma Spray Process: System Model,” Proc. of 8th National Thermal Spray Conference, Sep., 11-15, 1995, Houston, TX.
P. Gougeon and C. Moreau, “In-Flight Particle Surface Temp. Measurement: influence of the Plasma Light Scattered by the Particles,” J. of Thermal spray Tech, v2(3) 9/93, p. 229.
J.F. Blisson, et al, “Ensemble In-Flight Particle Diagnostics under Thermal Spray Conditions,” Thermal Spray 2001: New Surfaces for New Mil. ASM Int'l, Materials Park, OH 2001.
P. Nylen, et al, “On-line Microstructure and Property Control of a Thermal Sprayed Abrasive Coating,” Thermal Spray 2001: New Surfaces for New Mil. ASM Int'l, Mat. Park, 2001.
C.J. Friedrich, et al, “IR Thermographic Imaging-a Powerful Tool for On-Line Process Control . . . ” Thermal Spray 2001: New Surfaces for New Mil. ASM Int'l, Mat. Park, OH 2001.
Michel Vardelle, et al, “Plasma spray processes: diagnostics and control?” Pure Appl. Chem., vol. 71, No. 10, p. 1909-1918, 1999.
T. Renault, et al, “On-Line Control of Particle Spray Jet and Residual Stresses in Plasma Sprays,” 1st Int'l Thermal Spray Conf. 2000.
J.R.Fincke, et al, “The Influence of Injector Geometry and Carrier Gas Flow Rate on Spray Pattern,” Proc. of the United Thermal Spray Conf, 1997, Indianapolis, IN, ASM Intl.
J.R. Fincke, et al, “Diagnostics and control in the thermal spray process,” Surface and Coatings Technology 146-147 (2001) 537-543.
M. Gevelber, et al, “System Characterization and Plasma-Particle Distribution Anal . . . ” Proc. of IMECE 2000, Intl, Mech Eng. Conf and Exposition, Nov. 5-10, 2000, Orlando.
S. Sampath and H. Herman, “Rapid Solidification and Microstructure Development during Plasma Spray Deposition,” J. of Thermal Spray Tech, V. 5(4) Dec. 1996—445.
Gevelber Michael Alan
Wroblewski Donald Edward
Cyber Materials LLC
Leas James Marc
Paschall Mark H
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